For
age cells in census tracts where no cases were reported, set the numerator
to zero.

Once
the numerators and denominators have the same structure (AREAKEY x AGECAT),
they can be merged together, along with the ABSM data (by AREAKEY). For
age cells within areas where no cases were reported, we set the numerator
to zero.

This
work was funded by the National Institutes of Health (1RO1HD36865-01)
via the National Institute of Child Health & Human Development (NICHD)
and the Office of Behavioral & Social Science Research (OBSSR).